The ultimate guide to bit manipulation for coding interviews. Developed by FAANG engineers, practice with real-world interview questions, and get interview-ready in just a few hours.

This course teaches bit manipulation, a powerful technique to enhance algorithmic and problem-solving skills. It is a critical topic for those preparing for coding interviews for top tech companies, startups and industry leaders. Competitive programmers can take full advantage of this course by running most of the bit-related problems in O(1) complexity.

The course will begin by educating you about the number system and its representation, decimal and binary, followed by the six bitwise operators: AND, OR, NOT, XOR, and bit-shifting (left, right).

You will receive ample practical experience working through practice problems to improve your comprehension.

Upon completing this course, you will be able to solve problems with greater efficiency and speed.

Grokking Bit Manipulation for Coding Interviews

# Introduction

This is a classic question in Mathematics 🧮 for computers.


For example:

```
Inputs: 1, 3, 5, 7, ...
 
Output: Odd
```

```
Input: 2, 4, 6, 8, ...
 
Output: Even
```

# Problem statement
Write a program to check even or odd numbers.

Let’s consider an array of integers here and check each of them using the AND operator.

```
Input = {1, 2, 3, 4, 5, 6, 7, 8, 9}
 
Output: { "Odd" , "Even" , "Odd" , "Even" , "Odd" , "Even" , "Odd" , "Even" , "Odd" }
```

**Hint:** Print odd or even using Bitwise operator &.

# Solution

First, we check for `even` and then for `odd`.

Let's see how to check if a number is even or odd using the `&` operator.

This is an example of another Bitwise question. Think of the rightmost bit of a number and think of some logic that could solve this.

Getting Started

Number Systems, Bitwise, and Binary

Bitwise AND

Bitwise OR

Bitwise NOT

Bitwise XOR

Bit Shifting - Left, Right

Bitwise LeftShift Problems

Bitwise RightShift Problems

Final Thoughts

Challenge 2: Check If Number Is Even/Odd

Introduction